在基因毒性应激反应中,需要ATR/ATM介导的人类Rad17的酸化
S Bao1, R S Tibbetts, K M Brumbaugh
1Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, North Carolina 27710, USA.
Nature
|June 22, 2001
概括
基因毒性压力激活细胞循环检查点进行DNA修复. 人类Rad17 (hRad17) 通过ATM/ATR激酶的酸化对于这种DNA损伤反应至关重要,它调节细胞循环停止和DNA修复信号.
科学领域:
- 细胞生物学 细胞生物学
- 分子遗传学 分子遗传学
- 生物化学 生物化学
背景情况:
- 基因毒性压力激活细胞循环检查点,以促进DNA修复.
- 检查点蛋白的Rad家族,包括Rad17,Rad1,Rad9和Hus1,对于DNA损伤和分裂酵母的复制检查点激活至关重要.
- 人类Rad17 (hRad17) 在DNA损伤反应途径中的精确作用需要进一步阐明.
研究的目的:
- 研究人类Rad17 (hRad17) 与ATM和ATR检查点激酶之间的调控联系.
- 为了确定hRad17酸化在特定部位对基因毒性应激反应的功能意义.
- 阐明hRad17在DNA损伤诱导的G2检查点中的作用及其与检查点蛋白质复合体的关联.
主要方法:
- 用基因毒剂对人类细胞的治疗.
- 通过ATM/ATR激酶对Ser 635和Ser 645的hRad17酸化进行分析.
- 过度表达野生类型的hRad17和缺乏酸化的突变物 (hRad17AA).
- 评估G2检查点废除和细胞对基因毒性压力的敏感性.
- 使用共免疫沉试验调查hRad17与hRad1的关联.
主要成果:
- 在人类细胞中,基因毒剂诱导了hRad17在Ser 635和Ser 645的ATM/ATR依赖酸化.
- 突变hRad17AA的过度表达取消了DNA损伤诱导的G2检查点.
- 这种hRad17AA突变使人类纤维细胞对基因毒性压力敏感.
- 在电离辐射后,hRad17AA突变体未能与hRad1结合,与野生型hRad17不同.
结论:
- 在Ser 635和Ser 645中hRad17的ATM/ATR依赖酸化是DNA损伤检查点信号的关键早期事件.
- 这种酸化事件对于G2检查点的适当激活和细胞对基因毒性压力的抵抗至关重要.
- hRad17酸化调节了它与hRad1-hRad9-hHus1检查点复合物的相互作用,突出了它在DNA修复途径中的核心作用.
相关概念视频
Heart Failure V: Medical Management
224
Medical Management of Acute Decompensated Heart Failure (ADHF)The primary goals of therapy for patients hospitalized with acute decompensated heart failure (ADHF) include:Relieving symptomsOptimizing volume statusSupporting oxygenation and ventilationMaintaining cardiac output (CO) and end-organ perfusionIdentifying and addressing the cause of ADHFPreventing complicationsProviding patient education on factors precipitating HF exacerbationPlanning for dischargeOngoing monitoring and assessment...
224
Myocarditis III: Medical Management
179
Myocarditis: Comprehensive Medical ManagementMyocarditis, the heart muscle inflammation, requires a comprehensive medical management strategy that addresses the underlying cause, provides supportive care, manages symptoms, and reduces cardiac workload.Infections and Autoimmune CausesAdminister appropriate antimicrobial therapy when an infectious agent causes myocarditis. For instance, penicillin treats infections caused by Group A Streptococcus. In cases where autoimmune processes are...
179
Endocarditis III: Medical Management
217
Infective endocarditis management involves a multifaceted approach encompassing infection prevention, lifestyle modifications, pharmacological therapy, and surgical management.Infection Prevention:Hand Hygiene: Thorough handwashing is crucial to prevent the spread of infection. Hand hygiene should be performed regularly, especially before and after using the restroom.Oral Hygiene: Good oral hygiene is essential. It includes brushing teeth immediately after waking up and before bed, flossing...
217
06:59A Novel Approach for the Administration of Medications and Fluids in Emergency Scenarios and Settings
31.1K
This study presents a novel device that offers an easy route to quickly provide medications and fluids in patients with limited or difficult IV access. This small-diameter device is placed in the distal third of the rectum, allowing for ongoing medication and fluids...
31.1K
Inhaled Medications
757
Inhaled medications are crucial for managing chronic obstructive pulmonary disease (COPD) and asthma. They are essential for effective treatment and control, ensuring optimal respiratory health and well-being. Inhaled medication delivers drugs directly to the lungs, providing a rapid onset of action and reducing systemic side effects compared to oral or injectable medications. Three primary types of inhalation devices are used to administer these medications: nebulizers, metered-dose inhalers...
757
Preparing and Administering Inhaled Medications
38.2K
Source: Madeline Lassche, MSNEd, RN and Katie Baraki, MSN, RN, College of Nursing, University of Utah, UT
Inhaled medications are prescribed for conditions affecting the bronchi, which branch off of the trachea, and bronchioles, which are progressively smaller conducting airways spread throughout the lung tissue. These conditions can be classified as acute (i.e., temporary, with quick onset) or chronic (i.e., persistent and/or recurrent symptoms lasting months to years). Common acute conditions...
Inhaled medications are prescribed for conditions affecting the bronchi, which branch off of the trachea, and bronchioles, which are progressively smaller conducting airways spread throughout the lung tissue. These conditions can be classified as acute (i.e., temporary, with quick onset) or chronic (i.e., persistent and/or recurrent symptoms lasting months to years). Common acute conditions...
38.2K
